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Multi-band amplifier and dual-band amplifier

a transmission power amplifier and dual-band technology, applied in the direction of amplifiers with semiconductor devices/discharge tubes, amplifier combinations, amplifiers, etc., can solve the problems of multi-band operation of transmission power amplifiers, signals in the plurality of frequency bands cannot be concurrently amplified, etc., to improve the saturation characteristics of output power, increase non-linear influence, and increase circuit loss

Active Publication Date: 2018-04-26
UNIVERSITY OF ELECTRO-COMMUNICATIONS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention solves the problem of amplifying signals in multiple frequency bands using a single amplifier circuit, which leads to distortion and efficiency issues. It allows for the independent design of each amplifier circuit, improving design accuracy, suppressing saturation characteristics and distortion characteristics. This results in a multi-band power amplifier with high efficiency and less distortion.

Problems solved by technology

In the aforesaid research and development, how to achieve multi-band operation of a transmission power amplifier, which is a core technique of a wireless device, becomes a key problem; with the type in which signals in a plurality of frequency bands are amplified while switching the plurality of frequency bands, signals in the plurality of frequency bands cannot be concurrently amplified.

Method used

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  • Multi-band amplifier and dual-band amplifier
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  • Multi-band amplifier and dual-band amplifier

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first embodiment

[0077]FIG. 1A and FIG. 1B are diagrams showing the configuration of a multi-band amplifier according to a first embodiment of the present invention. The multi-band amplifier according to the present embodiment is a multi-band amplifier adapted to concurrently amplify signals in a plurality of frequency bands from a first frequency band to an N-th frequency band (N is a natural number not less than 2).

[0078]As shown in FIG. 1A, the multi-band amplifier according to the first embodiment of the present invention includes a signal input terminal 1 and a signal output terminal 2. The multi-band amplifier has a plurality of amplifier circuits from a first amplifier circuit to an N-th amplifier circuit, which are: amplifier circuits10, 20 . . . 50 . . . 70. Here N is a natural number not less than 2. Each amplifier circuit is a “transistor amplifier circuit” formed by a FET (Field Effect Transistor), and the “transistor amplifier circuit” will be simply referred to as an “amplifier circuit...

second embodiment

[0092]FIG. 2 is a schematic diagram showing the configuration of an amplifier according to a second embodiment of the present invention, and is a schematic circuit diagram showing a dual-band amplifier configured by two transistor amplifier circuits (which will each be simply referred to as an “amplifier circuit” hereinafter). As shown in FIG. 2, the dual-band amplifier includes a signal input terminal 3 and a signal output terminal 4. Further, the dual-band amplifier has two amplifier circuits 30, 40. The first amplifier circuit 30 is provided with, in an input signal dividing part thereof (which corresponds to the input side of the first amplifier circuit 30), an input-side blocking circuit 32 adapted to block the signal in a second frequency band. Further, the first amplifier circuit 30 is provided with, in an output signal combining part thereof (which corresponds to the output side of the first amplifier circuit 30), an output-side blocking circuit 33 adapted to block the signa...

third embodiment

[0107]FIG. 4 is a schematic diagram showing the configuration of an amplifier according to a third embodiment of the present invention, and is a schematic circuit diagram showing a dual-band amplifier configured by two transistor amplifier circuits (which will each be simply referred to as an “amplifier circuit” hereinafter). Note that, the same components shown in FIG. 4 are denoted by the same numerals as of FIG. 2 and the explanation thereof will not be repeated.

[0108]A first amplifier circuit 30 is provided with, in an input signal dividing part thereof (which corresponds to the input side of the first amplifier circuit 30), an input-side blocking circuit 36 adapted to block the signal in a second frequency band. The input-side blocking circuit 36 is a circuit whose parallel resonance frequency falls in the second frequency band, and is connected in series with the amplifier circuit 30. Since the impedance of a parallel resonance circuit is close to open at the parallel resonanc...

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Abstract

A concurrent-type multiband amplifier (or a dual-band amplifier) which amplifies multiband signals concurrently using a plurality of (N) amplifier circuits which each independently amplify signals in a plurality of (N) frequency bands. An n-th (n=any of 1 to N) amplifier circuit is provided with a circuit for blocking signals in frequency bands other than the n-th frequency band so as to amplify and output only the n-th frequency band signal. The n-th amplifier circuit is designed so as to consist of its input / output impedance matching circuit for the n-th an amplifier element at the n-th frequency band.

Description

TECHNICAL FIELD[0001]The present invention relates to a transmission power amplifier for a next-generation mobile communication system, particularly to a transmission power amplifier for a wireless communication device capable of coping with a plurality of frequency bands, which will be necessary for a next-generation mobile communication system in which advanced utilization of frequencies (such as frequencies for cognitive wireless communication) is progressed.BACKGROUND ART[0002]In recent years, due to the advancement of mobile communication / wireless LAN and the advancement of communication systems (such as cognitive wireless communication) in order to improve the efficiency of existing systems, necessary for coping with a plurality of communication methods and a plurality of signal frequency bands becomes higher, so that there is an increased demand for a multi-band amplifier capable of processing multi-band signals corresponding to a plurality of communication methods and a plur...

Claims

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Application Information

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IPC IPC(8): H04B1/04H03F3/68H03F3/24H03F1/02H03F3/217
CPCH04B1/0483H03F3/68H03F3/24H03F1/0277H03F3/217H04B2001/045H03F2200/111H03F2200/429H04B1/04H03F3/211H03F3/245H04B2001/0408H03F1/56H03F3/602H04B1/00
Inventor TAKAYAMA, YOICHIROHONJO, KAZUHIKOISHIKAWA, RYO
Owner UNIVERSITY OF ELECTRO-COMMUNICATIONS